78888940531 has 4 divisors (see below), whose sum is σ = 79145908072. Its totient is φ = 78631972992.

The previous prime is 78888940517. The next prime is 78888940547. The reversal of 78888940531 is 13504988887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78888940531 - 2²⁹ = 78352069619 is a prime.

It is a super-2 number, since 2×78888940531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78888940531.

It is not an unprimeable number, because it can be changed into a prime (78888940591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128483310 + ... + 128483923.

It is an arithmetic number, because the mean of its divisors is an integer number (19786477018).

Almost surely, 2^78888940531 is an apocalyptic number.

78888940531 is a deficient number, since it is larger than the sum of its proper divisors (256967541).

78888940531 is a wasteful number, since it uses less digits than its factorization.

78888940531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256967540.

The product of its (nonzero) digits is 15482880, while the sum is 61.

The spelling of 78888940531 in words is "seventy-eight billion, eight hundred eighty-eight million, nine hundred forty thousand, five hundred thirty-one".